Screen reolution and text size is too small
The default screen resolution on your MacBook Air is 1440 x 900 pixels. This takes full advantage of the display panel on the laptop, but does result in some small icons. You also have the option of choosing between 5 other resolution options, some of which are actually at a different ratio than the default setting. But you can easily switch between all of them to see which option your prefer.
Step 1: Click the System Preferences icon in the dock at the bottom of the screen.
Step 2: Click the Displays icon in the Hardware section of the window.
Step 3: Click the Scaled option at the center of the window, then choose your preferred resolution.
As you click a new resolution, your screen will automatically adjust to the change. This makes it very easy to try out all of the different options until you find the one that you prefer. Additionally, note that selecting the "Best for built-in display" option will default your MacBook Air back to the 1440 x 900 option.
Go to: System Preferences>Displays> Click on "Display" Tab, click on "Scaled" and they change the res.
SOURCE: Hanging blue screen on 13-inch MacBook
The issue is with the software.Boot the system with installation media and go to disk utility and repair the file permission.This can solv the issue.If still the issue persist.Then go ahed and format the drive and re install the software
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